kenyon



(No Model.)

J. W. KENYON. Steam Engine Recorder.

Patented Oct. 5,1880.

FIG.

N. PEIERS, PHOTOLITHOGRAFHER. WASHINGTON. D C.

PATENT JOHN W. KENYON, OF MANCHESTER, ENGLAND.

STEAM-ENGINE RECORDER.

SPECIFICATION forming part of Letters Patent No. 232,978, dated October5, 1880.

Application filed April 30. 1880. (No model.) Patented in England April1, 1878.

To all whom it may concern:

Be it known that I, J OHN WILLIAM KEN- YON, a subject of the Queen ofGreat Britain and Ireland, and residing at Manchester, county ofLancaster, England, have invented certain Improvements in Steam-EngineIndicators, (for which I have obtained a patent in Great Britain, No.1,278, April 1, 1878,) of which the following is a specification.

The object of my invention is to so construct a steam-engine *indicatorthat its indicating power can be readily changed, and means may beprovided for disconnecting the paper cylinder from the actuating cord. Iemploy a curved tube formed on the Bourdon principle, instead of apiston, and to disconnect the paper-cylinder I raise it out of gear witha separate wheel upon which the cord acts.

In the accompanying drawings, Figure 1 is a view, partly in section, ofa complete indicator. Fig. 2 represents the lower part of thepaper-cylinder and the cord-wheel and lifting attachment drawn toalarger scale. Fig. 4.is a plan of the same parts. Fig. 3 is a view ofthe lifting attachment. Fig. 5 shows the manner in which thepaper-cylinder and cord-wheel engage together.

In Fig. l, a is the curved tube. bis the paper-cylinder. c is thecord-wheel, and dis the lifting attachment. The part a is formed ofhollow hard brass or metal tube of an oval form in cross-section, as inthe ease of the ordinary Bourdon tube, or it may be of any suitablesectional form. One end of this tube is brazed, soldered, or attached tothe male part of a conical coupling, 6. The two parts of the couplingare forced together by means of a nut, f, so as to firmly secure thetube to the body-casting of the indicator, and at the same time to makea steam-tight joint. When the indicator is coupled up to thesteam-cylinder in the ordinary manner, the steam pressure or vacuum hasaccess through a passage, 9, to the interior of the tube, and causes thefree end h to move up and down or to and fro in proportion to the extentof such prsseure or vacuum. This free end is connected in any suitablemanner with the multiplying-leversi of the ordinary Richardspencil-motion, or with an arrangement of levers substituted therefor.

In the example the end It terminatesin a pin, upon which is mounted ashort tube, to which is jointed one end of a rod, The other end of thisrod is screwed into a ball which is socketed between the two levers i,so as to form a ball-and-socket joint. The short tube at his retained bya removable button. To exchange the curved tube a for a stronger orweaker tube, as may be required, the button is removed and the shorttube slipped off the pin at h. The tube a is now uncoupled at e, and thefresh tube is coupled up, and the attachment at h is slipped on the endof the pin and secured with the button. The body-casting is formed witha turned pillar, it, upon which the arm piece I swivels, in the samemanner as the corresponding piece swivels upon the cylinder in theordinary Richards indicator.

The paper-cylinder I) is mounted upon an inner cylinder, m, which isformed with a tubular boss bored to slide upon the ordinary fixed studn. A spiral spring, it, tends to force the cylinder at toward thecord-wheel c. The cord-wheel is formed with a box, 0, in which is theordinary volute spring, and is mounted to rotate upon the stud n, beingrotated in the one direction by the pull of the cord, and in the otherdirection by the action of the volute spring. A notch is formed in thelower edge of the cylinder m, and the cord-wheel is pro vided with atooth, as indicated by Fig. 5; or the disposition of the parts may bereversed. When the tooth and notch engage, the papercylinder and thecord-wheel rotate together, as if .they were attached, as is the case inthe ordinary indicator. 'W hen the cylinder m is raised so that thetooth clears the notch, the cord-wheel may still revolve, but thepapercylinder will remain at rest.

A forked lever, p, is hinged at 1' to a pillar. The two rounded ends ofthe fork pass below the flange on the lower end of the cylinder m. Atrigger, s, is employed to act upon this lever. Then this trigger ismovedinto the position indicated by the dotted lines in Fig. 3, theforked end of the lever 12 is raised, and, acting on the flange on thecylinder m, raises the paper-cylinder and disengages it from thecord-wheel. When the preparations for taking a diagram are completed, atouch of the finger upon the trigger releases the lever 12 and thepaper-barrel is pressed into gear by the spiral spring. Thetrigger-piece is stepped, so as to lower the paper-cylinder by twostages. The intention is, that the first step shall lower the cylinderuntil the flange lightly presses upon the tooth, so that, as it were,the tooth may feel for the notch without turning the paper-cylinder.This lifting attachment may be varied.

I claim as my inventionl. The combination of the curved tube connectedto the pencil-motion of a steam-engine indicator with the body-casting,adapted to be coupled to the steam-cylinder, and having a conduit, 9,and a detachable coupling connecting said conduit to the curved tube,substantially as described.

2. The combination of the cord-wheel and paper-cylinder. 1),- adapted.to slide. toward and 20 from such wheel, with devices, substantially asdescribed, for connecting and disconnecting the two.

3. The combination of the spring 16 with the paper-cylinder andcord-wheel, the two being 25 provided with corresponding teeth andnotch,

as and for the purpose specified.

4. The combination of the cord-wheel and cylinder with lever 19 andtrigger s, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

J. W. KENYON'.

